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First of all, my
company makes satellite radios, and I implemented SNMP support
(v1, v2) for our radios and switches, which use an SoC based on
ARM9 processor. I did this by using net-snmp utilities to talk
to snmpd, capturing packets in WireShark, and
reverse-engineering the various Get/GetNext/Set/GetBulk/Trap
requests and responses. This is working well, and I can
communicate successfully with our devices, using net-snmp
utilities and a Visual Studio application. Now we want to add v3 support... I've captured v3 comm sequences for authNoPriv and authPriv communications, but beyond that I'm in unknown territory... As a starter, I thought I'd just look at the authentication messages, and leave encryption for later, but I can't even figure out how to match the MD5 messages that I see in the packets; for one thing, all the MD5 utilities that I've seen, generate 16-byte messages, while the MD5 data (msgAuthParams) in these messages is only 12 bytes. Beyond that, I don't know what portion of the messages the digest is generated over. ITM, I tried looking at snmpget, and the functions in snmplib that this calls, but I got as far as generate_Ku() and am completely lost!! Are there tutorials somewhere, that will discuss at a higher level, how to handle the message generation for auth and encryption for snmpv3, preferably with respect to the openssl modules ?? And will I actually need detailed understanding of how encryption works before I can implement these functions?
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